K11 dual-caliber air-burst weapon

Caliber: 5.56x45mm NATO + 20x30B mm
Action: Gas operated, rotating bolt for 5.56mm and manually operated for 20mm
Overall length: 860 mm
Barrel length: 310 mm (5.56mm); 405 mm (20mm)
Weight: 6.1 kg (with optics and battery but less magazines)
Rate of fire: ?
Magazine capacity: 30 rounds of 5.56mm and 5 rounds of 20mm.
Made in South Korea
Using a 20mm grenade exploded in the air-programmed fuses and 5.56mm ammunition for the short and medium range direct fire.